The Magic Tree House adventures continue in books 9—12. Morgan the magical librarian of Camelot challenges Jack and Annie to discover the answers to four riddles as they travel under the sea to the Wild West, the African plains, and the frozen Arctic. If they succeed, they will become Master Librarians! Books in this set include: Dolphins at Daybreak (#9) Ghost Town at Sundown (#10) Lions at Lunchtime (#11) Polar Bears past Bedtime (#12).

About the Author

MARY POPE OSBORNE is the author of the New York Times number one bestselling Magic Tree House series. She and her husband, writer Will Osborne (author of Magic Tree House: The Musical), live in northwestern Connecticut with their three dogs. Ms. Osborne is also the coauthor of the companion Magic Tree House Fact Trackers series with Will, and with her sister, Natalie Pope Boyce.

SAL MURDOCCA has illustrated more than 200 children's trade and text books. He is also a librettist for children's opera, a video artist, an avid runner, hiker, and bicyclist, and a teacher of children's illustration at the Parsons School of Design. Sal lives and works in New York with his wife, Nancy.

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